RANKING · 2020 CENSUS · 54 SHOWN OF 54

Largest Scotch-Irish population, Montana counties · 2020

Montana counties ranked by the number of residents who are Scotch-Irish ancestry, from the 2023 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 54 counties in Montana that qualify, ranked against each other statewide.

MontanaAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPSCOTCH-IRISH POPULATIONVS 2000

01Missoula County, MTMT123,5131,979–

02Gallatin County, MTMT128,7401,737–

03Yellowstone County, MTMT172,6921,709–

04Flathead County, MTMT115,4291,457–

05Lewis and Clark County, MTMT75,3311,434–

06Cascade County, MTMT85,0291,084–

07Ravalli County, MTMT48,582899–

08Sanders County, MTMT14,062584–

09Lake County, MTMT33,392547–

10Lincoln County, MTMT22,328396–

11Park County, MTMT18,214301–

12Stillwater County, MTMT9,445279–

13Silver Bow County, MTMT36,118276–

14Carbon County, MTMT11,466255–

15Jefferson County, MTMT13,329204–

16Dawson County, MTMT8,692185–

17Madison County, MTMT10,026176–

18Rosebud County, MTMT8,253162–

19Fergus County, MTMT11,825149–

20Glacier County, MTMT13,463147–

21Mineral County, MTMT5,185145–

22Custer County, MTMT12,034141–

23Valley County, MTMT7,385105–

24Musselshell County, MTMT5,582104–

25Teton County, MTMT6,49692–

26Chouteau County, MTMT5,86585–

27Wheatland County, MTMT2,10080–

28Hill County, MTMT16,16774–

29Powell County, MTMT7,15770–

30Meagher County, MTMT2,13767–

31Carter County, MTMT1,38360–

32Deer Lodge County, MTMT9,70952–

33Prairie County, MTMT1,11248–

34Broadwater County, MTMT8,49347–

35Phillips County, MTMT4,20344–

36Beaverhead County, MTMT10,04344–

37Richland County, MTMT11,37743–

38Roosevelt County, MTMT10,24240–

39Sweet Grass County, MTMT3,76240–

40Pondera County, MTMT6,07237–

41Granite County, MTMT3,65823–

42Fallon County, MTMT2,95922–

43Powder River County, MTMT1,78122–

44Judith Basin County, MTMT2,16222–

45Toole County, MTMT5,21119–

46Garfield County, MTMT1,14818–

47Blaine County, MTMT6,86016–

48Daniels County, MTMT1,61216–

49Big Horn County, MTMT12,75215–

50Liberty County, MTMT1,95715–

51Treasure County, MTMT72814–

52Golden Valley County, MTMT8448–

53Petroleum County, MTMT5485–

54Sheridan County, MTMT3,4365–

SHOWING 1–54 OF 54

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UPDATED 2026-06-06 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES